运行demo报错type error怎么回事？

[txlfreedom]

Type error: Type 'string' is not assignable to type 'undefined'. TS2322

172 |                       type="number"
173 |                       onChange={action((e: React.ChangeEvent<HTMLInputElement>) => {

174 | this.camera[inputItem.key] = e.target.value; | ^ 175 | })} 176 | value={this.camera[inputItem.key] as string} 177 | required

[brucebnu]

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